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Re: DNS caches that support partitioning ?
From: Chris Woodfield <rekoil () semihuman com>
Date: Sun, 19 Aug 2012 13:00:49 -0700

What Patrick said. For large sites that offer services in multiple data centers on multiple IPs that can individually 
fail at any time, 300 seconds is actually a bit on the long end.

-C

On Aug 18, 2012, at 3:43 PM, Patrick W. Gilmore <patrick () ianai net> wrote:

On Aug 18, 2012, at 8:44, Jimmy Hess <mysidia () gmail com> wrote:

And I say that, because some very popular RRs have insanely low TTLs.

Case in point:
www.l.google.com.    300    IN    A    74.125.227.148
www.l.google.com.    300    IN    A    74.125.227.144
www.l.google.com.    300    IN    A    74.125.227.146
www.l.google.com.    300    IN    A    74.125.227.145
www.l.google.com.    300    IN    A    74.125.227.147
www.l.google.com.    300    IN    A    74.125.227.148

Different people have different points of view.

IMHO, if Google losses a datacenter and all users are stuck waiting for a long TTL to run out, that is Very Bad.  In 
fact, I would call even 2.5 minutes (average of 5 min TTL) Very Bad.  I'm impressed they are comfortable with a 300 
second TTL.

You obviously feel differently.  Feel free to set your TTL higher.

-- 
TTFN,
patrick





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